Selected for piloting
The White
Working Group:Early InquiryCountry:LatviaLanguages:Czech, Dutch, English, German, Greek, Latvian, PolishAge of students (target group/s):6-12, 13-14Contact person information:Inese Liepina
This email address is being protected from spambots. You need JavaScript enabled to view it.
Ruta Puida, a teacher from Daugavpils Centra Secondary School, developed a lesson on substance recognition. Every day at home, we see a member of our family use various ingredients for cooking: salt, sugar, flour, etc. Especially, the three mentioned are similar to each other (they are white powders) and thus, they are difficult to distinguish one from another. A misuse of the substances makes our dish no longer enjoyable. How can we recognize the ingredients easily?
Students work in groups and each of them chooses a substance to identify. Then they write what they want to learn about the substances.
Students describe the substance and its appearance: solid, liquid, gas.
The following experiments were made to test the ingredients:
Detection of starch
Structure Determination
White diversity characteristics
Substance separation techniques: settling, filtering
Finally, conclusions about the ingredients were drawn (what exactly they were).Strong points and opportunities:Practical experiments close to real life.Limitations:Structured inquiry – experiments were set by the teacher.Added value with regards to the 3 topics of the MASS project:WG2 – early inquiry, practical experiment.
WG3 – interesting, close connection to the everyday life.Any prerequisites needed:Equipment for chemical tests